Within that desired AA, I really don't have much preference in terms of breaking that down further within each asset class. Probably lean more large caps.

I currently have 8K in a brokerage account with TD Ameritrade
I have 3K in my work Roth 401K. I contribute 10% and company matches 2% right now.
I have $5500 sitting in TD Ameritrade Roth IRA that I just contributed to three days before Tax Day. That's what I'm looking for advice with how to invest.

It is fine to hold Vanguard index funds at TD Ameritrade as long as you aren't paying and trade fees. See if you can buy the Admiral version of the funds (compared to the higher cost Investor shares).

A Total US stock market fund would be the first type of account to add to your Roth IRA. Due to minimums you might want to just use the Total US Stock index for your first $5,500 purchase.

One recommendation. Switch to Pre-tax 401k unless you are in the 15% tax bracket. Pay tax "40 years from now". Invest the higher amount now, let it grow. It also reduces your taxable income which can keep you in a lower tax bracket.

Pre-tax 401k + Roth IRA. Next target would be HSA if you have that as an option.

"We are here not to please but to provoke thoughtfulness" Unknown Boglehead

Do you have any other assets you haven't listed? You indicate you want 15%-20% of your assets in bonds, but all I'm seeing is the 0.85% of your 401k in bonds. You may want to consider putting some of your IRA in bonds in order to fulfill your desired asset allocation.

Also, since you're in the 25% bracket, you may want to think about investing in traditional retirement accounts versus Roth.

It is fine to hold Vanguard index funds at TD Ameritrade as long as you aren't paying and trade fees. See if you can buy the Admiral version of the funds (compared to the higher cost Investor shares).

A Total US stock market fund would be the first type of account to add to your Roth IRA. Due to minimums you might want to just use the Total US Stock index for your first $5,500 purchase.

One recommendation. Switch to Pre-tax 401k unless you are in the 15% tax bracket. Pay tax "40 years from now". Invest the higher amount now, let it grow. It also reduces your taxable income which can keep you in a lower tax bracket.

Pre-tax 401k + Roth IRA. Next target would be HSA if you have that as an option.

Thanks Bloom. Of all the things I looked at it appeared that a Total US Stock index is something that appealed to me in terms of just adding the whole market. That's a great point on doing a Traditional 401K. When I was choosing a few months ago I honestly didn't know the biggest difference except that people loved throwing around the word "roth'' for a younger employee/investor.